Brake



p R. N. VAN BUSKIRK BRAK E 5 Sheets-sheet 1 Filed April 14, 1928 W n mwm T e 6 0 R ATTORNEY p 1933. R. N. VAN BUSKIRK 1,928,081

BRAKE Filed April 14, 1928 3 Sheets-Sheet 2 ill- ATTORNEY Sept. 26,1933. R. N. VAN BUSKIRK 1,928,081

BRAKE Filed April 14, 1928 V 3 Sheets-Sheet 3 IE1 5 E RoberZNVanBwkific/5 IHVENTOR ATTORNEY Patented Sept. 26, 1933 BRAKE I Robert N.Van-Buskirk, Detroit, Mich, assignor to'lfiendix Brake Company,- SouthEend,lnd., a corporation of Illinois i Application April 14, 1928."Serial No. 270,021j 10 Claims. (01.188-78) This invention relates tobrakes, and is illus- 1 trated as embodied in an internal expandingautomobil brake. An object of the invention is to provide a simple andvery-powerful brake which is inexpensive to manufacture on a largescale. Various features relate to the use of a novel brake backing plateto support and posi tion the brake friction means when the brake isreleased, to an improved operatingdevice in-v eludingoppositely-arranged eccentric thrust pins shown as acting on the ends ofa friction band, to simple band-positioning devices, and to other noveland desirable constructions and arrangements which will be apparent fromthe fo1lowl5 ing description of the illustrated embodiments shown in theaccompanying drawings, in

' which: 7

Figure l is a vertical section through the brake just inside the head ofthe brake drum, and show-.

ing the brake friction means in side elevation;

Figure 2 is. a diametricseotion through the brake on the line 2-2 ofFigure l; t Figure 3 is a partial section through the operating means,on the line 33 of Figure 1; I

Figure 4 is a partial radial section through the brake on the line 4-4of Figure l;

- Figure 5 is a side elevation of part of the brake friction means,removed-from the brake;

Figure 6 is a view corresponding to the upper part of Figure 1, butshowing the brake friction means expanded against the brake drum;

Figure 7 is a partial section on the line 7-7 of Figure 3, showing adetail of the operating means;

Figure 3 is a similar view to Figure 7 but showing the operating shaftmounted in its support;

Figure 9 is a vertical diametric section, corresponding to the upperportion of Figure 2, but showing a modified brake having T-shaped-rigidshoes;

Figure 10 is a section on the line 1010 of Figure 9, showing theoperating means;

Figure 11 is a vertical diametric section, corresponding to the lowerportion of Figure 2, but showing the brake of Figure 9;

Figure 12 is a view corresponding to the upper portion of Figure 1, butshowing the brake of Figure 9; i

Figure 13 is a radial section corresponding to Figure 4, but showing thebrake of Figure 9; and

Figure 14 is a View corresponding to Figure 1, but with the brakefriction means and theoperating means removed, and showing a modifiedbacking plate construction.

Figure 15 is a section on the line 1571501 Figure 14 showing in detailthe mounting of the backing plate. Q The brake of Figures 1-8 includes arotatable drum l0, at'the open side'of whichare arranged a lightstamping or ,dust plate 12 substantially closing the open side of thedrumjand a heavier backing plate 14. Plates 12 and 14 maybe securedtogether, if desired, and. at any rate are prefer-- ably held byv thesame'fastening's' passing through 35 openings 16 ,into the front wheelknuckle not shown) or into a flange on theirear axle (not sh0wn).' I ,i

lhe backingplate 14 preferably has anfannu lar peripheral zone orfiange1 8 atits outer edge '7 l which is oiiset substantially into the centralplane of the brake, and on which the brake friction means-in thisinstance, a, continuous flexible band 20-rests when the brake isreleased, LBand' 29.1 849 be provided with upper and lower: U'. =35shaped stampings or guides z2jiwelded or: other wise secured at theirbases to the bandand hav? ing their sides embracing. the flange 18.'These guides may, be provided with pins 241 .held by means such ascotter pins 26, and whichiipi'ns pass through .slots 28 in thefiange 18.lAIpair of. tension springs 30 areshown connected "attheir lower endstothe two lower guides 22 and t their upper ends to flange'lS, and tendmerge the lower portion of ba'nd 20flaway f-romkthe '55" drum'."

A pair of L-shap'ed stampings' 32 weldedor Q otherwise secured to theinnerface of band: 20 5 approximately at the center: of the bandfand varranged spaced a short distance apart andback 9o 1 to back, areformed-withslots 34 embracing flanged rollers 36 having centralhubsseated in an opening in flange'lS and heldin place by a clamp bolt 38.The flangesof-rollers ,36enibrace stampings 32.

point, the slots 34 are made equal in width to the' diameter of therollers 36, thus holding the band 20 against any except radial movementat this point. In this arrangement the rollers 36 form. the anchor ofthe brake. v taken at the ends of the band, the slots 3 l'are somewhatwider than the diameter of the rollers.- I prefer the formerarrangement.

At the separable ends of the band, U-shaped fittings 40 and 42 areprovided. These fittings have their bottoms welded or riveted to theends of the band, and have their sides embracingthe flange 18. The brakemay be appliedby operating means such as a shaft 44 having a head 0 .Ifthe torque of the brake is" to be taken at this If the torque is to bestamped i Shaft 44 is journaled in a support 54 bolted to.

flange 18, and having the central portion in which the shaftis journaledoffset from this flange to afford clearance for head 46." Bolts 56 forthe support may pass through slots 58 in flange 18,,

and be drawn up only tightly enough to hold the support when the brakeis released, thus permitting it to shift to balancethe pressures onfittings and 42 in case of uneven wear. through large clearance openings60 infittings 40 and 42.

As will be apparent from Figures 1, 6, 7 and 8, flange 18 is formed withan irregularly-shaped opening 62 for the thrust pins48. This opening hascurved portions permittingthe pins to move freelyaway from idle positionto apply the brake, and shoulders engaging-the pins in idle position andpreventing them from moving in the opposite directions. It should benoted that pins 48 are .a direct applying thrust to fittings 40 and 42.

I In the arrangement. of Figures 9-13, band 20 has single stampings 70welded to its inner face,

- giving a T-section construction. Stampings 70 band. A nut-82threaded'on pin 76 holds a washer-84between' which andfiange 18 thefitting are, arranged beside and in engagement with flange 18, and haveslots 72 embracing guide pins 741riveted to flange 18. The anchor inthis case is 'apin '76 riveted to the flange 18 and projecting through aslot- '78 in a fitting 80 carried by the 80 is confined.

- The brake is applied by engagement of the pins 48'with fittings orstampings 86 and 88 welded or otherwisesecured to the ends of the band,and corresponding to fittings 40 and 42. Shaft 44 in this instance isjournaled in a forged bracket 90 riveted to flange 18'. The dust plate12' base drawntubular boss 92 closely fitting over a portion of thisbracket.

In the arrangement of Figures 14 and 15, flange 18 is replaced by aseparately-formed fiat ring 94 secured to'an ordinary backing plate 96by means such as posts or studs 98.

Bolts 56 pass side said plate, an operating shaft for said band,

ticular embodiments, or otherwise than by the terms of the appendedclaims.

I claim: I

l. A brake comprising, in combination, a rotatable drum, an expansiblefriction device within the drum having separable ends, an operatingshaft having two oppositely-arranged eccentric parts respectivelyengaging said ends and a back ing plate having its edge arranged tosupport the band when released. 2. A brake comprising, in combination, arotatable drum, an expansible frictiondevice'within the drum havingseparable ends, an operating shaft having two oppositely-arrangedeccentric parts respectively engaging said ends, and a plurality ofanchoring means for taking the braking torque from an intermediateportion of said device.

3. A brake having, in combination, a stationary supporting member, andan operating member having a pair of oppositely-offset eccentric pins,the supporting member having an opening through which the pins projectand which permits the movement of the pins iromidle position by turningthe operating member in one direction but which prevents movement ofsaid pins in the opposite direction from idle position.

4. A brake comprising, in combination, a rotatable drum, a pair ofplates secured together adja cent their inner edges and one of whichsubstantially closes the open side of the drum while the other has itsouter edge approximately in the central plane of the brake, and afriction device resting on said edge when the brake is released.

5. A brake comprising, in combination, a rotatable drum, a pair ofplates secured togetheradjacent their inner edges and one of whichsubstantially closes the open side of the drum, and a friction devicepositioned by the other of the plates when the brake is released.

6. A brake backing plate having a supporting ring, secured in spacedrelation thereto.

"7. A brake backing plate having a supporting ring arranged in spacedrelation thereto, and

posts'rigidly securing the ring to the plate.

8. A brake comprising a drum, a supporting plate, a band encircling andresting on said plate, parts carried by the band and straddling saidplate, and an anchor member carried by the plate and projectinginopposite directions through said parts.

9. A brake comprising a plate, a band encircling said plate and havingparts extending along-' and a shaft bearing secured to the plate byfastenings passing through openings in said parts. 10. A friction bandhaving a series of fittings secured to its inner face and which haveparallel inwardly-extending portions formedwith aligned openings. 1

ROBERT N. VAN BUSKIRK.

